John Callahan aka Edmund Grey of 'All My Children' passes away at 66

John Callahan, best known for playing Edmund Grey on 'All My Children', has passed away at the age of 66. Celebrities who knew him are coming together to mourn his demise.

After news of Callahan's death was made public on Saturday, a number of his former co-stars paid tribute to their late friend. Callahan died on March 28th, after suffering a stroke the previous day and having been put on life support.

"Because there are no words, all I can muster is Rest In Peace #johncallahan," wrote Kelly Ripa, who played Hayley Vaughan on the long-running soap from 1990 to 2002. The television host went on to send her condolences to the actor's ex-wife Eva LaRue, a fellow 'All My Children' alum, and their 18-year-old daughter Kaya. Ripa got emotional while talking about Callahan during Monday's episode of 'Live With Kelly and Ryan'. She said that she and his other friends have been remembering him by 'thinking of the best Callahan-isms'.

Sarah Michelle Gellar, who was on the soap opera from 1993 to 1995, also spoke of fond memories for the actor. "He stepped into a lot of moments in my life because I didn't have a father to be there," she wrote, adding that the 'greatest joy in his life' came 'when he had a daughter of his own.' "John left us this morning. I promise you GP just as you were there for me, I will always be there for smoosh (Kaya) and @evalarue as well," Gellar added.

Finola Hughes also mourned the loss of her costar, whom she remembered as being 'always ready with a fun story or joke.'

The soap opera star, who was best known for playing Edmund Grey on All My Children from 1992 to 2005, died after having a massive stroke. After having a stroke on Friday, he was put on life support and his immediate family members were able to say goodbye before he was pronounced dead.

LaRue went on to pay tribute to her 'great friend' in a touching tribute on behalf of herself and their daughter Kaya, 18.